Dashiell Hammett mentioned Sam Spade's jutting chin in the opening sentence of his novel, "The Maltese Falcon." Spade's chin was among the f
Chimpanzees, humans' closest living relatives, do not have a chin. Neither did Neanderthals, Denisovans, or any other extinct human species. Humans, it turns out, have a unique capacity to "take it on the chin" because we're uniquely in possession of that physical feature. That exclusive nature makes the chin well suited for identifying Homo sapiens in the fossil record. In simplest terms, a chin is a bony projection of the lower jaw. So why is it there? How and why did it evolve? The answer, part of a study published in the journal PLOS One by a team led by a University at Buffalo biological anthropologist, broadens the holistic understanding of the human body as an amalgamation of adaptations and random byproducts of evolution.
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